Santorini is the last island that we visited. We stayed there for 3 nights as it was the largest & the island with most "sights" to see. The whole island (& the smaller 1's around it) were formed by a volcano. We did the tourist thing & took a tour boat out to "ground zero" which was then a hard walk to the crater(in 35 degree heat), but worth it .We also hired a little 4wd for a day & explored the island with another couple from our group - checked out 4 different beaches & even went for a tasting at a local winery...